Hi Andrew,
Thanks for reaching out! Unfortunately adding categories to venues is not something that is available out of the box, but you could add them via a customization or possibly with a third-party plugin. I did a quick search and found this one, but I have not tested it out.
Our themer’s guide is the place to start if you’d like to do the customization, or we also have a list of recommended developers if you’d like to get help with the code.
I’d also recommend posting this request over in our Feature Ideas Forum if it’s something that you would like to see added in the future. This is what we use to gauge user interest in new features and help guide future development efforts.
I’m sorry I don’t have a more straightforward solution for you, but I hope this helps! Please let me know if you have any questions.
Thanks,
Jennifer